8520 blank screen and led flashing

Hi i have a 8520 that dint want to start. so i proceeded to try and reinstall the software.
it just got stuck on serching for device upgrades after trying a 4th time the phone's led strats flashing 2 flahes then 3 and repeate i cannto detect it on my pc anymore and it does nothing but flash did leave batery out for an hour to no avail.
please help!
Thanks!

Hi and Welcome to the Community!
I recommend you first prepare with these steps:
1) Make sure you have a current and complete backup of your BB...you can find complete instructions via the link in my auto-sig below. In your situation, this is moot.
2) Uninstall, from your PC, any BB OS packages
3) Make sure you have the BB Desktop Software already installed
http://us.blackberry.com/software/desktop.html
4) Download and install, to your PC, the BB OS package you desire:
http://us.blackberry.com/support/downloads/download_sites.jsp
It is sorted first by carrier -- so if all you want are the OS levels your carrier supports, your search will be quick. However, some carriers are much slower than others to release updates. To truly seek out the most up-to-date OS package for your BB, you must dig through and find all carriers that support your specific model BB, and then compare the OS levels that they support.
5) Delete, on your PC, all copies of VENDOR.XML...there will be at least one, and perhaps 2, and they will be located in or similarly to (it changes based on your Windows version) these folders:
C:\Program Files (x86)\Common Files\Research In Motion\AppLoader
C:\Users\(your Windows UserName)\AppData\Roaming\Research In Motion\BlackBerry\Loader XML
Now, use these tricks:
KB10144 How to force the detection of the BlackBerry smartphone using Application Loader
KB27956 How to recover a BlackBerry smartphone from any state
http://crackberry.com/blackberry-101-lecture-12-how-reload-operating-system-nuked-blackberry
If any suggest an update website, please substitute the Desktop Software and/or LOADER.EXE.
Good luck and let us know!
Occam's Razor nearly always applies when troubleshooting technology issues!
If anyone has been helpful to you, please show your appreciation by clicking the button inside of their post. Please click here and read, along with the threads to which it links, for helpful information to guide you as you proceed. I always recommend that you treat your BlackBerry like any other computing device, including using a regular backup schedule...click here for an article with instructions.
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